External-node in Docker ignores SIGTERM

[yorickdowne]

🐛 Bug Report

📝 Description

The external-node image ignores SIGTERM and does not attempt a shutdown.

If stop_signal: SIGINT is added to the compose yml, then the node shuts down cleanly

In addition, clean shutdown can take close to 90s: Recommend adding stop_grace_period: 5m to the sample compose yml

🔄 Reproduction Steps

Run an external node with the sample compose at https://github.com/matter-labs/zksync-era/blob/main/docs/guides/external-node/docker-compose-examples/mainnet-external-node-docker-compose.yml, issue a docker compose down while also watching logs, observe it does not attempt to shut down, nor has enough time to do so if it did.